Upgrading tests with unittest deprecations

tests/lib/async/timer_cancel_test.dart

Index: tests/lib/async/timer_cancel_test.dart
diff --git a/tests/lib/async/timer_cancel_test.dart b/tests/lib/async/timer_cancel_test.dart
index 25c459b0e87e5d29816b2d4796912fc62f57100e..57e10069b2f898949c6ec07a5a3cb1d7e726cb30 100644
--- a/tests/lib/async/timer_cancel_test.dart
+++ b/tests/lib/async/timer_cancel_test.dart
@@ -28,17 +28,17 @@ main() {
       expect(repeatTimer, 1);
     }
 
-    cancelTimer = new Timer(ms * 1000, expectAsync0(unreachable, count: 0));
+    cancelTimer = new Timer(ms * 1000, expectAsync(unreachable, count: 0));
     cancelTimer.cancel();
-    new Timer(ms * 1000, expectAsync0(handler));
-    cancelTimer = new Timer(ms * 2000, expectAsync0(unreachable, count: 0));
+    new Timer(ms * 1000, expectAsync(handler));
+    cancelTimer = new Timer(ms * 2000, expectAsync(unreachable, count: 0));
     repeatTimer = 0;
-    new Timer.periodic(ms * 1500, expectAsync1(repeatHandler));
+    new Timer.periodic(ms * 1500, expectAsync(repeatHandler));
   });
 
   test("cancel timer with same time", () {
     var t2;
-    var t1 = new Timer(ms * 0, expectAsync0(() => t2.cancel()));
-    t2 = new Timer(ms * 0, expectAsync0(t1.cancel, count: 0));
+    var t1 = new Timer(ms * 0, expectAsync(() => t2.cancel()));
+    t2 = new Timer(ms * 0, expectAsync(t1.cancel, count: 0));
   });
 }